c#将json转换为dynamic对象（推荐）-白红宇

c#将json转换为dynamic对象（推荐）

阅读量：2287 次

发布时间：2019-05-09

本文共 3514 字，大约阅读时间需要 11 分钟。

来自：http://outofmemory.cn/code-snippet/1246/c-jiang-json-switch-dynamic-object

DynamicJsonConverter类如下：

using System;using System.Collections;using System.Collections.Generic;using System.Collections.ObjectModel;using System.Dynamic;using System.Linq;using System.Text;using System.Web.Script.Serialization;private sealed class DynamicJsonConverter : JavaScriptConverter{    public override object Deserialize(IDictionary
   
     dictionary, Type type, JavaScriptSerializer serializer)    {        if (dictionary == null)            throw new ArgumentNullException("dictionary");        return type == typeof(object) ? new DynamicJsonObject(dictionary) : null;    }    public override IDictionary
    
      Serialize(object obj, JavaScriptSerializer serializer)    {        throw new NotImplementedException();    }    public override IEnumerable
     
       SupportedTypes    {        get { return new ReadOnlyCollection
      
       (new List
       
        (new[] { typeof(object) })); }    }    #region Nested type: DynamicJsonObject    private sealed class DynamicJsonObject : DynamicObject    {        private readonly IDictionary
        
          _dictionary; public DynamicJsonObject(IDictionary
         
           dictionary) { if (dictionary == null) throw new ArgumentNullException("dictionary"); _dictionary = dictionary; } public override string ToString() { var sb = new StringBuilder("{"); ToString(sb); return sb.ToString(); } private void ToString(StringBuilder sb) { var firstInDictionary = true; foreach (var pair in _dictionary) { if (!firstInDictionary) sb.Append(","); firstInDictionary = false; var value = pair.Value; var name = pair.Key; if (value is string) { sb.AppendFormat("{0}:\"{1}\"", name, value); } else if (value is IDictionary
          
           ) { new DynamicJsonObject((IDictionary
           
            )value).ToString(sb); } else if (value is ArrayList) { sb.Append(name + ":["); var firstInArray = true; foreach (var arrayValue in (ArrayList)value) { if (!firstInArray) sb.Append(","); firstInArray = false; if (arrayValue is IDictionary
            
             ) new DynamicJsonObject((IDictionary
             
              )arrayValue).ToString(sb); else if (arrayValue is string) sb.AppendFormat("\"{0}\"", arrayValue); else sb.AppendFormat("{0}", arrayValue); } sb.Append("]"); } else { sb.AppendFormat("{0}:{1}", name, value); } } sb.Append("}"); } public override bool TryGetMember(GetMemberBinder binder, out object result) { if (!_dictionary.TryGetValue(binder.Name, out result)) { // return null to avoid exception. caller can check for null this way... result = null; return true; } var dictionary = result as IDictionary
              
               ; if (dictionary != null) { result = new DynamicJsonObject(dictionary); return true; } var arrayList = result as ArrayList; if (arrayList != null && arrayList.Count > 0) { if (arrayList[0] is IDictionary
               
                ) result = new List

用法如下：

string json = ...;var serializer = new JavaScriptSerializer();serializer.RegisterConverters(new[] { new DynamicJsonConverter() });dynamic obj = serializer.Deserialize(json, typeof(object));

例如给定的字符串如下：

{  "Items":[    { "Name":"Apple", "Price":12.3 },    { "Name":"Grape", "Price":3.21 }  ],  "Date":"21/11/2010"}

执行结果：

var data = serializer.Deserialize(json, typeof(object));data.Date; // "21/11/2010"data.Items.Count; // 2data.Items[0].Name; // "Apple"data.Items[0].Price; // 12.3 (as a decimal)data.Items[1].Name; // "Grape"data.Items[1].Price; // 3.21 (as a decimal)

转载地址：http://trunb.baihongyu.com/

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